问题

___ comes to saving energy, bigchanges start with small steps, like turning off the lights

A:whether
B:that
C:what
D:why

正确答案是：

同类题型

Do you have to say about your family

He ______to swim across the Channel, but they failed because of the terrible weather

My computer began to return to the ______ running state after I killed the virus by newly-updated Kaspersky.

This is really a wonderful party with interestingpeople and great food.—I’m glad you are _____.

Skating on the ice is ______.